Onset distractor 任务： 红色的distractor 眼跳至此 E X 在target出现后的 处，并识 0,80,150ms出现 别圈中的 Target 字母 (target) 剩一个不变，其余的圆圈由灰 + 虚线→红实线；所有的圈中的 mask变成字母。 Fixation (Theeuwes et al.1999) ® Figure 1.Sequence of events during a trial.After a 1,000-ms fixation,all gray circles (dashed lines)except one changed to red 國 * (solid lines);at the same time the small premask inside the circles 1000ms changed to letters.Depending on the condition an additional red onset distractor circle was added to the display with either a 0-,80-, or 150-ms stimulus onset asynchrony.Participants had to make an ⑧ eye movement to the gray circle (color singleton)and respond to the identity of the small letter located inside the gray circle.The stimuli are not drawn to scale.1000ms 红色的distractor 在target出现后的 0,80,150ms出现 剩一个不变，其余的圆圈由灰 虚线 红实线；所有的圈中的 mask变成字母。 任务： 眼跳至此 处，并识 别圈中的 字母 (target) (Theeuwes et al. 1999)